Just like the title says.
Just like the title says.
Ummm...KAM?
In reply to Keith Tanner:
Keep Alive Memory (maybe it's a Ford guy term 
) In other words, completely re-set the learned tuning values back to Day Zero so it will learn new values after installing any power adders.
Must be a Ford thing. The Miata PCM is pretty stupid, it only has long-term fuel trims. You can check those with an OBD-II reader to see where they are, but they mostly only adapt to things like failing sensors and clogged injectors.
If you've installed a power adder, it's up to you to ensure the fuel and timing is correct. Don't expect the PCM to figure it out.
That said, I'm pretty sure a power cycle will reset any learned behavior.
In reply to Keith Tanner:
Never heard an OBDII PCM described as stupid before! I guess that explains the popularity of MS and Hydra...
WildScotsRacing wrote: In reply to Keith Tanner: Never heard an OBDII PCM described as stupid before! I guess that explains the popularity of MS and Hydra...
Comared to a carburetor the stock NB is smart. Compared to a modern ECU, not so much.
If by "power adder" you mean a turbo or a supercharger, then you're going to want a significant upgrade in engine control, just resetting the stock ECU isn't going to do much.
The NB Miata PCM is not reflashable without physical hardware modification, and even then there's not that much you can do. It's not like a GM LS3 PCM that's easily tuned and tweaked. It wasn't exactly cutting edge when it was new, and it was new 18 years ago. That's why MS/Hydra/etc is so popular, because it gives you the ability to tune the car. Even the aftermarket ECUs might not be as sophisticated as the stock unit, but the ability to tune them goes a long, long way.
The ND is the first Miata that's actually an up-to-date car electronically.
Yeah, I'm used to playing with the Ford ECC-V PCM, which was hacked almost the minute it hit the streets about 20 years ago. Even today it's a pretty powerful and tunable PCM, there is almost nothing you can't do with it.
I won't be using boost or N2O, just thinking in terms of ported head, Intake/Header/Exhaust/Timing bump. Basically maximizing the naturally aspirated air flow throughput of what is there. I'm used to clearing the PCM learned tuning after making a flow improvement to get the most power out of the PCM re-learning new values. The Ford ECC-V is finished learning after 400 miles and won't adapt well to flow improvements after that, so you re-set it. But, you say the NB2 PCM doesn't really re-learn like that, right?
Nope. If you're running lean due to the extra airflow - pretty unlikely - then it'll adjust the long term trim to add it with or without a reset.
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